/* DocAttributeSet.java -- 
   Copyright (C) 2003, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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package javax.print.attribute;

/**
 * <code>DocAttributeSet</code> specifies an attribute set which only
 * allows printing attributes of type 
 * {@link javax.print.attribute.DocAttribute}.
 * <p>
 * The methods {@link #add(Attribute)} and {@link #addAll(AttributeSet)} are
 * respecified in this interface to indicate that only 
 * <code>DocAttribute</code> instances are allowed in this set.
 * </p>
 * 
 * @author Michael Koch (konqueror@gmx.de)
 */
public interface DocAttributeSet extends AttributeSet
{
  /**
   * Adds the specified attribute value to this attribute set 
   * if it is not already present.
   * 
   * This operation removes any existing attribute of the same category 
   * before adding the given attribute. 
   * 
   * @param attribute the attribute to add.
   * @return <code>true</code> if the set is changed, false otherwise.
   * @throws ClassCastException if attribute is not of type 
   * <code>DocAttribute</code>.
   * @throws NullPointerException if the attribute is <code>null</code>.
   * @throws UnmodifiableSetException if the set does not support modification.
   */
  boolean add (Attribute attribute);

  /**
   * Adds all of the elements in the specified set to this attribute set.
   * 
   * @param attributes the set of attributes to add.
   * @return <code>true</code> if the set is changed, false otherwise.
   * @throws ClassCastException if one of the attributes is not of type 
   * <code>DocAttribute</code>.
   * @throws UnmodifiableSetException if the set does not support modification.
   * 
   * @see #add(Attribute)
   */
  boolean addAll (AttributeSet attributes);
}